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• W1990994951 abstract "The inner-core region of the lipopolysaccharide of an UDPGalNAc-4-epimerase-deficient mutant of Yersinia enterocolitica 0:3, designated as Ye75R, was investigated using methylation analysis, 1D-13C-NMR and 2D-13C-NMR and 1H-NMR, as well as 31P-NMR, fast-atom-bombardment mass spectrometry (FAB MS) and FAB MS/MS in positive and negative modes. The isolated core heptasaccharide (OS) was composed of 2 units d-glucose, 3 units ld-heptose and 1 unit each of dd-heptose and 3-deoxy-d-manno-octulosonic acid. Methylation analysis indicated that OS was highly branched with terminal location of the two glucoses and the dd-heptose unit, which was partially (to about 40%) phosphorylated at C7. These combined studies allowed us to formulate the structure of the inner core region as shown in Scheme 1. The substitution of the 7-position of the terminally linked dd-heptose unit by phosphate could be recognized by MS characterization of permethylated dd-heptose-7-phosphate (alditol acetate) and the extent of the substitution by the ratio of the two well separated 1H signals of dd-heptose in 500-MHz 1H-NMR. Negative FAB MS of OS also indicated the presence of smaller amounts of two hexasaccharides, differing from OS in lacking either one terminal unit of d-glucose or of the terminal dd-heptose, and additionally of a pentasaccharide lacking two heptosyl units, namely the terminal dd-heptose and and the subterminal ld-heptose. The presence of the smaller oligosaccharides in the OS fraction was also recognized by the methylation analysis." @default.
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• W1990994951 date "1994-04-01" @default.
• W1990994951 modified "2023-09-27" @default.
• W1990994951 title "The inner core region of Yersinia enterocolitica Ye75R (0:3) lipopolysaccharide" @default.
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• W1990994951 doi "https://doi.org/10.1111/j.1432-1033.1994.tb18746.x" @default.
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